IPhone, VPN and 'data roaming' (UK)
I had great difficulty setting up a VPN link to my university server. Even with identical settings to those on my laptop(s) the iPhone persistently produced the immediate message 'the server does not exist' (Oh! yes it does!). This applied on the EDGE, and more than one WiFi network. (And of course I checked the name very carefully!)
Anyone else with similar problems might like to know that I have solved this, for reasons I am unclear about, by:-
1 - substituting the (hopefully static) numeric IP address for the VPN server name
2 - turning 'on' Data Roaming (default being off)
Neither of these two measures works on their own but the combination works fine. Whilst the first might be easily explained by some DNS issue I do not see why the second measure is necessary, and there are dark warnings about charges in the handbook. What is 'data roaming' and why should it make a difference even when logged into the phone's home network?
Comments appreciated!
When you are outside the normal O2-UK coverage zone (i.e., in another country), then the phone is "Roaming". The Data Roaming switch can be used to control whether the iPhone tried to make a GPRS/EDGE data connection when the phone is roaming. I.e., when your phone is connected to a non-02 network.
If you are in the UK and connected to 02 while trying to connect to your VPN server, then you should not need to turn Data Roaming on. However, if you are trying to connect to your VPN server whilst outside the UK, then I would expect you to need to turn on Data Roaming (unless you are using WiFi)
Hope that clear things up.
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